Two lamps of 8 CP and 32 CP are placed 99 cm apart . Where should a screen be put on the line joining them so that it is equally illuminated

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Q. Two lamps of luminous intensity of

8

C d

and

32

C d

respectively are lying at a distance of

1.2

m

from each other. Where should a screen be placed between two lamps such that its two faces are equally illuminated due to the two sources?

Q. Two point charges

q_{1} = + 9 μ C

and

q_{2} = - 1 μ C

are held

10 cm

apart. Where should at third charge

+ Q

be placed from

q_{2}

on the line joining them so that charge

Q

does not experience any net force ?

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